v2.3.0.11
Property, Plant and Equipment (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Property, plant and equipment    
Land $ 193 $ 191
Buildings and improvements 1,762 1,605
Machinery and equipment 6,908 6,409
Rental tools and equipment 2,669 2,472
Subtotal 11,532 10,677
Less: Accumulated depreciation 4,832 4,367
Total $ 6,700 $ 6,310